Vehicle Seat Reclining Device Sharp Corner Memory Pin
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Solution Overview
Problem
Conventional vehicle seat reclining devices experience noise and reduced durability due to premature locking of the locking member during the walk-in access enabling action, as the memory pin enters the engagement slot before fully disengaging from the sliding surface, applying unnecessary load on the locking and rotating members.
Innovation Solution
A seat reclining device with a first rotating member, a second rotating member, a locking member, a first memory member with a sliding surface, and a second memory member, where the first memory member includes an engagement slot and the second memory member has a slide-trailing end with sharp corners, allowing precise engagement and disengagement to restrict relative rotation only at the appropriate position, reducing noise and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the memory pin enters the engagement slot during the walk-in access enabling action, then the locking member is locked, but this causes premature locking while rotating members are still moving relative to each other, producing noise and reducing durability
Solution Approach 1:
The patent applies preliminary action by ensuring the memory pin is completely disengaged from the sliding surface before entering the engagement slot. The rotating member is designed to complete its rotation to a predetermined position where the memory pin has fully cleared the sliding surface, eliminating premature locking and the associated noise and wear during the walk-in access enabling action.
2Ease of operation
If the memory pin slides on the outer circumferential surface of the memory ring, then the locking action is restricted, but this allows premature engagement with the engagement slot
Solution Approach 1:
The patent applies local quality by designing distinct functional zones on the memory ring: a sliding surface for controlled sliding motion and an engagement slot for precise locking. The memory pin interacts differently with each zone - sliding on the outer circumferential surface during normal operation and engaging with the engagement slot only when completely disengaged from the sliding surface, ensuring precise engagement timing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures accurate and durable locking of the locking member, reducing noise and extending the lifespan of the device by preventing premature engagement and maintaining the unlocked state until the intended position is reached, allowing smooth operation and improved user experience.
Implementation Method 1
a first memory member that is capable of rotating coaxially and integrally with the first rotating member by frictionally engaging with an outer surface of the first rotating member and capable of rotating relative to the first rotating member against frictional engagement force
Implementation Method 2
The first memory member includes a sliding surface that, by sliding on the second memory member, restricts engaging action of the second memory member that is accompanied by the locking of the locking member
Data Source
AI summary
When a first memory member rotates relative to a second rotating member to a predetermined relative rotation position at which a second memory member sliding on a sliding surface is capable of entering an engagement slot, the slide-trailing end of the second memory member, which leaves the sliding surface last, is a corner having no round shape. Further, the boundary between the sliding surface and the engagement slot is also a corner having no round shape.